Schemas

The following table describes the schemas supported by GaussDB.

Do not create service data of users in a schema that provides functional APIs, including but not limited to tables and functions (such as dbe_* and pkg_*).

**Table 1** Schemas supported by GaussDB
Schema	Description
db4ai	Manages data of different versions in AI training.
dbe_perf	Diagnoses performance issues and is also the data source of WDR snapshots. After a database is installed, only the initial user and monitoring administrator have permission to view views and functions in this schema by default.
dbe_pldebugger	Debugs PL/SQL functions and stored procedures.
snapshot	Manages data related to WDR snapshots. By default, the initial user or monitoring administrator can access the data.
sqladvisor	Is used for distribution key recommendation and is unavailable in centralized deployment.
sys	Provides the system information view APIs.
pg_catalog	Maintains system catalog information, including system catalogs and all built-in data types, functions, and operators.
pg_toast	Stores large objects (for internal use).
public	Public schema, which is used to store public objects. If search_path is not specified and a schema with the same name exists, new tables (and other objects) are created in the schema by default. If no schema with the same name exists, new tables (and other objects) are automatically placed in this public schema.
pkg_service	Manages information about the package service.
pkg_util	Manages information about the package tool.
dbe_raw	Advanced function package dbe_raw, which is used to convert raw data, obtain substrings, and calculate the length.
dbe_session	Advanced function package dbe_session, which is used to set the value of a specified attribute and support user query and verification.
dbe_lob	Advanced function package dbe_lob, which is used to read, write, and copy large files (CLOB/BLOB).
dbe_match	Advanced function package dbe_match, which is used to compare character string similarity.
dbe_task	Advanced function package dbe_task, which is used to schedule job tasks, including submitting tasks, canceling tasks, synchronizing task status, and updating task information, so that the database can periodically execute specific tasks.
dbe_sql	Advanced function package dbe_sql, which is used to execute dynamic SQL statements and construct query and other commands during application running.
dbe_file	Advanced function package dbe_file, which is used to read, copy, write, delete, and rename external database files.
dbe_output	Advanced function package dbe_output, which is used to print output information.
dbe_random	Advanced function package dbe_random, which is used to generate random seeds and random numbers.
dbe_application_info	Advanced function package dbe_application_info, which is used for recording client information.
dbe_utility	Advanced function package dbe_utility, which is used to call the debugging tool in a stored procedure, for example, to print error stacks.
dbe_scheduler	Advanced function package dbe_scheduler, which is used to create scheduled jobs and enable the database to periodically execute specified tasks through programs and schedules. You can also perform external database tasks by authorizing and providing certificates.
information_schema	Stores information about objects defined in the current database.
dbe_pldeveloper	Compiles and debugs user stored procedures.
dbe_sql_util	SQL O&M function, including the O&M API of SQL patches.